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Business Combinations and Asset Acquisitions - Celgene Shanghai (Details) - USD ($)
$ in Thousands
9 Months Ended
Aug. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Business Acquisition        
Cash paid to acquire business   $ 221 $ 0  
Goodwill   $ 109   $ 109
Celgene Shanghai        
Business Acquisition        
Equity interests (as a percent) 100.00%      
Beigene HK | Celgene Shanghai        
Business Acquisition        
Equity interests (as a percent) 100.00%      
Total purchase price $ 28,138      
Discount related to the Share Subscription Agreement 23,606      
Goodwill 109      
Other net assets 20,529      
Beigene HK | Celgene Shanghai | Trading license        
Business Acquisition        
Cash paid to acquire business 4,532      
Intangible assets acquired $ 7,500